Mold for concrete.



P. W. HILL.

MOLD FOR CONCRETE. n APPLIOATION FILED 141221.22, 1910.

1,008,264. Patented Nov. 7, 1911.

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COLUMBIA PuNoaRAPH c0., WASHINGTON. D. c.

PETER W. HILL, OF BOSTON, MASSACHUSETTS.

MOLD FOR CONCRETE.

Specification of Letters Patent.

Patented Nov. *7, 1911.

Application filed September 22, 1910. Serial No. 583,197.

To all whom it may concern:

Be it known that I, PETERW. HILL, of Boston, in the county of Suffolk and State of Massachusetts, have invented certain new and useful Improvements in Molds for Concrete, of which the following is a specification.

This invention relates to collapsible molds such as those employed in concrete construction for forming conduits.

The-object of the invention is to provide a mold comprising a plurality of sections connected in a series by hinges and formed so that the hinges, by reason of their arrangement, cooperate in limiting the opening movement of the several sections. The collapsible mold forms a part of a combination which includes one or more spreaders which are adapted to engage the two sections at the ends of the series of sections when the sections are in open position and thus lock the end sections in open position, further opening of the sect-ions being limited, as previously stated, by the hinges. The hinges are relatively remote from the formgiving surface of the mold, thus not only serving to limit the opening of the sections but causing the form-giving surface of the mold to recede at all points from the hardened concrete when the mold is collapsed.

Of the accompanying drawings which illustrate one form in which the invention may be embodied: Figure 1 represents in cross section what is termed an open cut, in which the mold is installed ready for use. Fig. 2 represents a cross section of the mold in collapsed condition. Fig. 3 represents a section on line 33 of Fig. 1. Fig. 4 represents a side elevation of one of the spreaders, omitting the sliding extensions. Fig. 5 represents a top plan view of one of the sliding extensions for the spreader. Fig. 6 is a sectional view showing the mold in verted and disposed so as to form an arch.

The same reference characters indicate the same parts wherever they occur.

The mold as shown by the accompanying drawings comprises a plurality of sections 10, 10, which, as viewed in a transverse plane, constitute a series. In the form illustrated there are two sections in the series, but it should be understood that three and possibly more sections may be included in the series.

The sections are connected by hinges 11, so arranged that the free edges of the sections may abut against each other when the mold is closed, at least two hinges being provided for connecting each section with the adjacent sect-ion. The construction of each section includes two or more ribs, as indicated at 12. The free ends of the end sections are provided with longitudinal beams 18. The form-giving surface of the mold is afiorded by lagging 1 1, which in the form illustrated is composed of boards which extend longitudinally and which are fastened to the ribs 12. The hinge-connected portions of the ribs 12 are provided with faces 15, 15, which abut against each other when the sections are open, thus limiting the opening movement of the sections. In conduit construction, the end faces 15, 15, are so arranged as to position one section in angular relationto the next section. The curvature of the'lagging in the form illustrated is such as to produce a semi-cylindric surface on the concrete; but it should be understood that the arrangement ,of the lagging may be varied to produce a curve of any desired character or produce a flat surface if necessary without afiecting the angular relation of the sections when the mold is open.

The purpose of the longitudinal beams 13 is to give strength to the sections and to afford means whereby the mold may be supported from above or below in the desired position. The invention includes spreaders 16 for holding the sections in open position, as shown by Fig. 1. The spreaders are provided with abutments or shoulders, which in the form illustrated are afforded by blocks 17 afiixed so as to engage the confronting faces of the beams 13 when the spreader is laid transversely with its ends lying upon the outer faces of the beams 13. The blocks 17 thus lock the sections in open position, quite regardless of whether the mold comprises two, three or more sections. The spreaders are provided with means whereby they may be employed for suspending the mold. As shown by Figs. 1 and 1, the blocks 17 are provided with plates 21 which are attached by bolts 23. Each plate (see Fig. 3) is provided with a slot-22 for the reception of the bolts 23 which are aflixed', in the blocks 17 The plates are therefore adapted to slide longitudinally of the spreader so that their outer ends may be projected into engagement with the inner faces of the beams 13, as shown by Fig. 1. The length of the spreaders is preferably slightly less than the width of the mold, for a reason hereinafter explained. The spreaders are provided with extensions in the form of plates 24. The plates are provided with slots 25 and are attached to the spreader by bolts 26 which extend through the slots 25. The plates are so arranged that their outer ends may be retracted to the ends of the spreader and may be projected to a considerable distance beyond the ends of the spreader. The bolts 26 are provided with nuts 27 by which the extensions 24% may be clamped tightly against the spreader at any desired position. The extensions may, therefore, when extended, be utilized for supporting the spreaders, and the spreaders through the medium of the plates 21 serve to support the mold.

It is customary in forming a conduit in an open cut to line the upright walls of the out with boards, as indicated at 19, in order to prevent the walls from crumbling. Beams 20 extending longitudinally of the open cut may be affixed to the boards 19 and may be used to support the outer ends of the extensions 24, as shown by Fig. 1. The width of the open cut usually varies at different points, the variation amounting to six inches, more or less, depending upon the size of the cut. The extensions 24 may be adjusted by reason of their slots 25 to compensate for variations in the width of the cut, so that they may reach the supporting beams 20 regardless of the Width of the out. By adjusting the extensions so that their outer ends abut against the upright boards 19, the mold may be positioned laterally and be securely held against dislodgment when the nuts 27 are tightened.

After the space in the bottom of the out has been filled with concrete up to the top of the mold, and after the concrete has become sufliciently hard, the mold is removed by first removing the spreaders, and by then drawing together the upper edges of the mold to the position shown by Fig. 2. If the mold is to be thereafter used for forming an arch to complete the conduit, it is in verted.

When the spreaders are attached to the inverted mold they occupy the space between the upper edges of the concrete which has previously hardened, and it is therefore necessary to retract the extensions 24 before applying the spreaders. The spreaders may be attached and detached by swinging one end horizontally, since the mold is made to permit such movement. This method avoids the necessity of loosening the bolts which bolt the plates 12.

So far as the mold itself is concerned, the feature which is considered new is the arrangement of the hinges which permits the free edges of the sections to meet when the mold is closed, and the arrangement of the abutting faces 15 which in conjunction with the hinges limit the opening movement of the sections, so that all that is necessary to lock the mold in open position is to provide spreading means for preventing the free ends of the end sections from moving to- Ward each other. In combination with the mold constructed as described, the spreader serves six purposes: first, it holds the mold in open position; second, it suspends the mold by means of the plates 21; third, it is provided with extensions by which it may be supported beyond the side of the mold; fourth, it is adapted by reason of the sliding extensions to compensate for variation in the width of an open cut; fifth, it is adapted by reason of the sliding extensions to position the mold laterally in any vertical plane within the range of the slots 25; sixth, it is adapted to be shortened to a length less than the width of the mold and to support the mold when the mold is inverted.

I claim:

1. A mold comprising duplicate sections having a hinge connection adjacent one end, confronting longitudinally extending beams at the other ends of said sections, spreaders extending transversely of said sections and provided with shoulders for abutting the inner longitudinal edges of said beams, plates adjustably connected to said shoulders and adapted to be extended beneath said beams, and support-engaging extensions adjustably connected to the ends of said spreaders.

2. A mold for arches comprising sections hinged together at one end and including ribs the abutting ends of which limit the opening movements of said sections, longitudinally extending beams carried by the free ends of said sections, spreaders having abutments for engaging said beams to retain the sections relatively spread, suspending means carried by said abutments for engaging said beam, and means adjustably connected to the ends of said spreaders and adapted for engagement with supports.

3. A collapsible mold comprising duplicate sections including transversely extending ribs, hinges connecting oppositely disposed ribs adjacent one of their ends, said hinge connected ribs having their ends adjacent said hinges adapted for contact to limit the relative spreading of the sections, spreaders provided with means for engaging the free ends of said sections to prevent closing movement thereof, adjustable means carried by said spreaders adapted for engaging supports, and means carried by said spreaders for engaging the free ends of said sections to suspend the same.

4. A collapsible mold comprising a section hinged at one end, beams carried by the free end of said sections, spreaders provided with blocks for engaging said beams to prevent plates to adjustably fasten the same to the 10 closing movements of said sections, plates end portions of said spreaders.

provided with longitudinal slots, means ex- In testimony whereof I have aflixed my tending through said slots to adjustably signature, in presence of two witnesses.

fasten said plates to said block to permit said blocks to be projected beneath said PETER W. HILL. beams, supporting engaging plates provided Witnesses:

with longitudinal slots, and means extending W. P. ABELL,

through the slots of the last mentioned JOHN E. POVEY.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. G. 

